WO2008059019A2 - Dispositif présentant un circuit transducteur à structure modulaire - Google Patents

Dispositif présentant un circuit transducteur à structure modulaire Download PDF

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Publication number
WO2008059019A2
WO2008059019A2 PCT/EP2007/062395 EP2007062395W WO2008059019A2 WO 2008059019 A2 WO2008059019 A2 WO 2008059019A2 EP 2007062395 W EP2007062395 W EP 2007062395W WO 2008059019 A2 WO2008059019 A2 WO 2008059019A2
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WO
WIPO (PCT)
Prior art keywords
signal processing
processing unit
application
sensor
type
Prior art date
Application number
PCT/EP2007/062395
Other languages
German (de)
English (en)
Other versions
WO2008059019A3 (fr
Inventor
Michael Philipps
Original Assignee
Endress+Hauser Gmbh+Co.Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE200610054421 external-priority patent/DE102006054421A1/de
Priority claimed from DE200620018584 external-priority patent/DE202006018584U1/de
Application filed by Endress+Hauser Gmbh+Co.Kg filed Critical Endress+Hauser Gmbh+Co.Kg
Priority to EP07822635.4A priority Critical patent/EP2087319B1/fr
Priority to US12/312,583 priority patent/US8380463B2/en
Priority to CN2007800426939A priority patent/CN101583849B/zh
Publication of WO2008059019A2 publication Critical patent/WO2008059019A2/fr
Publication of WO2008059019A3 publication Critical patent/WO2008059019A3/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25014—Fieldbus general name of bus connected to machines, detectors, actuators
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25314—Modular structure, modules

Definitions

  • the invention relates to a device with a modular transducer circuit according to the preamble of claim 1.
  • Process control technology devices are regularly used, which measure process variables by means of sensors in the process flow or controlled by actuators controlled variables.
  • the corresponding devices determine, for example, the pressure, the flow, the fill level, the dielectric constant, the boundary layer, the temperature or a different physical and / or chemical process variable as a process variable in a process flow.
  • Applicants have produced and sold such devices as field devices under the names Cerabar, Deltabar, Deltapilot, Promass, Levelflex, Micropilot, Prosonic, Soliphant, Liquiphant, Easytemp, which are primarily intended to provide at least one of the above-identified process variables of a medium to determine and / or monitor a container.
  • a common feature of all the above-mentioned devices or field devices is that from the determined by the sensors process variables by means of a downstream electronics, a measured value is determined and evaluated.
  • This electronics is usually adapted to the corresponding measurement requirements and the process variable to be measured in such a way that independent electronics have to be developed for each sensor principle, for each process variable to be measured and for each measurement performance.
  • the near-sensor signal processing is usually designed as ASIC (application-specific integrated circuit), which is often produced in large quantities.
  • ASIC application-specific integrated circuit
  • Another solution is, for example, to equip field devices with different measurement accuracy standards, with uniform electronics and with maximum measurement performance, and to activate or deactivate the individual functionalities by software, for example.
  • a disadvantage of these electronics is that the cost of electronics does not behave proportional to the required measurement performance and no modularity is given.
  • the object of the invention is to provide a device whose measurement performance and functionality can be easily adapted to the requirements and which is inexpensive to implement.
  • a device having at least one sensor for detecting at least one chemical and / or physical process variable and at least one modular transducer circuit, which determines at least one sensor unit, which determines an electrical measured variable from the process variable detected by the sensor Sensor supplied with the necessary energy, and at least one application-specific signal processing unit for determining a measured value from the electrical measurement, wherein the transmission of a conditioned output signal between the sensor unit and the application-specific signal processing unit is provided, wherein the application-specific signal processing unit is designed interchangeable, and wherein Depending on a predeterminable measurement accuracy of the measured values, at least one of a plurality of different types of application-specific signal processing units can be used.
  • the signal processing unit is followed by a control / evaluation unit, which is provided for the evaluation and further processing of the measured value, as well as for controlling and regulating the device.
  • An advantageous embodiment of the device according to the invention provides that a first type of application-specific signal processing unit is provided for applications with a low demand on the measurement accuracy.
  • the device provides a second type of application-specific signal processing unit for applications with a medium requirement for measurement accuracy.
  • a third type of application-specific signal processing unit is provided for applications with a high demand on the measurement accuracy.
  • the first type of application-specific signal processing unit comprises at least one low-pass circuit.
  • the invention provides that the low-pass circuit provides a measured value proportional to the electrical measured variable as an analog current signal or an analog voltage signal.
  • a supplementary embodiment of the device according to the invention allows the second type of application-specific signal processing unit comprises at least one counter circuit.
  • the third type of application-specific signal processing unit comprises at least one analog-to-digital converter circuit.
  • the counter circuit and / or the analog-to-digital converter circuit provide a proportional to the electrical measurement value as a digital signal.
  • At least the first type, the second type and / or the third type of application-specific signal processing unit is permanently integrated in the transducer circuit.
  • An embodiment of the device according to the invention provides that in the transducer circuit at least one slot for modular exchange of different types of the application-specific signal processing unit is provided.
  • a switching element is provided on the slot.
  • Another preferred embodiment of the invention is concerned with the case that a verification unit is provided, the plausibility check or validation of the introduced from the inserted into the slot first type, second type or third type of application-specific signal processing unit measured values with the allows measured values determined in the transducer circuit integrated first type, second type or third type of application-specific signal processing unit.
  • At least one line-connected connection for the transmission of the uniformly modulated output signal between the sensor unit and the application-specific signal processing unit is provided.
  • An advantageous embodiment of the device according to the invention is to be seen in that at least one separating element is provided for galvanic isolation of the line-connected connection.
  • Device provides that a wireless connection for transmitting the power, the data and the uniformly modulated output signal between the unitary sensor unit and the application-specific signal processing unit is provided.
  • a common clock line or a preamble in the uniformly modulated output signal for synchronization e.g. the clock frequency, the application-specific signal processing unit and the sensor unit.
  • At least one optical waveguide for transmitting the energy, the data and the uniformly modulated output signal between the unitary sensor unit and the application-specific signal processing unit.
  • a preferred embodiment of the device provides, in particular, that setting parameters for supplying the different types of sensors and / or for evaluating the electrical measured variable of the different types of sensors are stored in the sensor unit.
  • an automation routine for adjusting the determined type of the connected sensor corresponding adjustment parameters is provided in the sensor unit.
  • the device provides a parameterization unit, the data transmitted at least for setting the adjustment parameters and / or data for adjusting the conditioning of the uniformly conditioned output signal to the sensor unit.
  • a pulse-width-modulated signal is provided as the uniformly conditioned output signal.
  • the invention provides that a frequency-modulated signal is provided as the uniformly conditioned output signal.
  • a supplementary embodiment of the device according to the invention allows that a pulse-phase-modulated signal is provided as a uniformly conditioned output signal.
  • the sensors are designed as a thermistor, PTC thermistor, semiconductor temperature sensor, thermocouple, pyroelectric temperature sensor, Curie effect temperature sensor and / or fiber optic temperature sensor for determining a temperature as an electrical parameter of the process variable.
  • the process variable pressure in a Convert proportional electrical quantity, provided to determine a pressure as an electrical measure of the process variable.
  • An embodiment of the device according to the invention provides that sensors which operate on a capacitive, conductive, piezoelectric measuring principle or transit time measuring principle, are provided for determining a level or a limit level in a container as an electrical parameter of the process variable.
  • An embodiment of the device according to the invention is concerned with the case that sensors operating on a magnetic-inductive measuring principle, Coriolis, Wirbelstromplete- or transit time measurement principle or Venturi, Blenden-, or dynamic pressure probe principle, to determine a flow as electrical measurement of the process variable are provided.
  • Fig. 1 a first embodiment of an inventive
  • FIG. 1a shows a further first embodiment of a device according to the invention with a modular transducer circuit for OEM products
  • Fig. 2 a second embodiment of an inventive Device with a modular transducer circuit
  • FIG. 5 shows a fifth embodiment of a device according to the invention with a modular transducer circuit
  • FIG. 6 shows a sixth embodiment of a device according to the invention with a modular transducer circuit
  • FIG. 7 shows a seventh embodiment of a device according to the invention with a modular transducer circuit
  • FIG. 9 shows a first application example of the fifth exemplary embodiment of the device according to the invention in a distributed process measuring system
  • FIG. 10 shows a second application example of the fifth exemplary embodiment of the device according to the invention in a distributed process measuring system.
  • the invention is to equip a transducer circuit 3 with components such as a unified sensor unit 4, a control / evaluation unit 11, a power supply unit and a communication interface 22 in accordance with pre-assembled and depending on measurement performance or desired accuracy of the measured value MW of the process variable P. at least a first type 5a, a second type 5b and / or a third type 5c of the application-specific signal processing unit 5 modular use.
  • the transducer circuit 3 with the sensor 2 is installed directly, without integration in a transmitter 23, in a device or a system.
  • This transducer circuit 3 converts the electrical Measured variables M of connected sensors 2 in a measured by a proportional, analog or digital measurement signal measured value MW.
  • a sensor 2 or sensor is a technical element which certain physical or chemical process variables, such. B. the level, flow, pressure, the pH, the temperature, the humidity, the conductivity as the electrical quantity M quantitatively determined.
  • process variables P are detected by the sensors 2 by means of physical or chemical effects and converted into a proportional, further processable, electrical measured variable M.
  • the signal processing unit 5 also includes, for example, a signal conditioning unit that linearizes, amplifies, scales and / or calibrates the determined measurement signal. In Fig.
  • a first embodiment of a device 1 according to the invention with a transmitter 23 and a sensor 2 is shown.
  • the device 1 is generally referred to as a field device or sensor system.
  • a modular transducer circuit 3 is provided, which is constructed at least from a unitary sensor unit 4 and a first type 5a of the application-specific signal processing unit 5.
  • the first type 5a of the application-specific signal processing unit 5 is provided for applications with a low requirement for the measurement accuracy of the measured values MW of the process variable P determined with the device 1.
  • the term "measurement accuracy" in the measurement technology means the degree of correspondence between the measured value MW determined and the absolute actual value of the measured value MW. If necessary, as shown in FIG.
  • a control / evaluation unit 11 and a communication interface 22 are integrated in the transmitter 23.
  • At least one sensor 2, which determines a process variable P in a process is connected to the transmitter 23.
  • the process variables P in a process are, for example, process-dependent, physical variables, such as the pressure, the level, the flow, the temperature, and medium-dependent, physical variables, such as the density, the conductivity of the medium.
  • This process variable P detected by the sensor 2 is detected by the sensor unit 4 and converted into an electrical measured variable M on the basis of the sensor unit 4 set by the present adjustment parameters X.
  • the sensor unit 4 is specified as to how to record the process variable P of the sensor 2 and to convert it into a modulated output signal AS corresponding to the electrical measured variable M.
  • the sensor unit 4 is designed so that each electrical measurement variable M is transmitted to the application-specific evaluation unit 5 as a corresponding conditioned modulated output signal AS.
  • the sensor unit 4 is set via the adjustment parameters X such that, depending on the height of the determined electrical measured variable M, a proportional, modulated output signal AS is transmitted via a line-connected connection 14.
  • a conditioned, modulated output signal AS for example, a pulse width modulated, frequency modulated, pulse phase modulated current voltage, optical or electromagnetic signal can be used.
  • a signal converter 9 converts the averaged output signal AS smoothed by the low-pass filter 6 into a corresponding analog current signal AI or an analog voltage signal AU and / or adapts the size assignment of the smoothed, averaged output signal AS to the analog current signal AI or voltage signal AU.
  • This signal converter 9 is integrated, for example, in the control / evaluation unit 11, but this signal converter 9 can also be integrated in the module of the application-specific signal processing unit 5 of the first type 5a.
  • the analog current signals AI or voltage signals AU are then forwarded either directly to other electronic units in devices such as the OEM area (Original Equipment Manufacturer) or via a communication interface 22 of the device 1 according to the invention, to other field devices or a control center 30.
  • OEM manufacturer is understood to mean a manufacturer who produces self-produced partial products and / or products for device or plant builders.
  • a further first embodiment of a device 1 according to the invention with a modular transducer circuit 3 and a sensor 2 is shown.
  • This embodiment of the device 1 is constructed so that the transducer circuit 3, contrary to the transducer circuit 3 of FIG. 1, does not include a control / evaluation unit 11 and communication interface 22.
  • the device 1 is fed directly into a higher-level measuring system or device, e.g. integrated in the OEM range, and the measured value MW is output by the signal converter 9 as a scaled, analog current signal AI or analog voltage signal AU.
  • Fig. 2 is a second embodiment of an inventive
  • the modular transducer circuit 3 is constructed at least from a unitary sensor unit 4 and a second type 5b of the application-specific signal processing unit 5 for an application with an average requirement for the measurement accuracy.
  • This second type 5b of the application-specific signal processing unit 5 is designed, for example, as a counter circuit 7, which samples the conditioned output signal AS accordingly.
  • the counter circuit 7 is designed, for example, as a microcontroller for signal processing.
  • the counter circuit 7 samples the modulated output signal AS by means of sampling pulses and determines therefrom a value corresponding to the electrical measured variable M and the process variable P.
  • a same clock is provided.
  • a clock generator 10 is integrated in the signal processing unit 5, which supplies the sensor unit 4 and the signal processing unit 5 with the same clock signal via a clock line 13.
  • the digitized value determined from the sampled output signal AS is forwarded to a control / evaluation unit 11 which generates a measured value MW therefrom by means of further signal processing and evaluation algorithms.
  • This measured value MW of the device 1 according to the invention is sent via a communication interface 22, for example as a digital signal DS on the fieldbus 33 or as an analogue communication signal after the current loop standard lying between 4 mA and 20 mA on a two-wire line 33 to further electronic units, field devices or a control center 30 ,
  • a communication interface 22 for example as a digital signal DS on the fieldbus 33 or as an analogue communication signal after the current loop standard lying between 4 mA and 20 mA on a two-wire line 33 to further electronic units, field devices or a control center 30 .
  • Fig. 3 is a third embodiment of an inventive
  • the modular transducer circuit 3 is constructed at least from a unitary sensor unit 4 and a third type 5c of the application-specific signal processing unit 5 for an application with a high demand on the measurement accuracy.
  • an analog-to-digital converter circuit 8 was inserted into the slot 12, which allows fast and highly accurate to determine an exact measured value MW of the process variable P from an electrical measured variable M converted in the uniform, modulated output signal AS.
  • a / D converter circuit which can be used in the device according to the invention is described, for example, in EP 0 237 583 B1.
  • galvanic isolation is prescribed since the process space or the elements in contact with the process have to be grounded due to the requirements of explosion protection.
  • the reference ground of the devices 1 and the field devices according to the invention mostly deviate from the ground potential. The difference in the two potentials results in a voltage that is applied between the grounded process elements and the device 1, thereby causing a current.
  • This current has the disadvantage that the lines of the reference ground are additionally stressed by the current flow. This can lead to energy being stored, so that the type of protection "intrinsic safety" of the field device or of the device 1 is no longer guaranteed .
  • Fig. 4 is fourth embodiment of an inventive
  • Device 1 with a modular transducer circuit 3 shown, in which the communication of the electrical parameter M and the data D between the sensor unit 4 and the application-specific signal processing unit 5 via a wireless connection 15 takes place.
  • a specific analog-to-digital converter circuit 8 is specified in the exemplary embodiments of FIGS. 4 and 5, which enables a fast and highly accurate determination of the measured value from the process variable.
  • the structure and mode of operation of this special analog-to-digital converter circuit 8 can be found, for example, in EP 0 237 583 B1 and will not be discussed here in further detail. Above all else, this wireless connection 15 is advantageous if the power supply and the communication between sensor unit 4 and signal processing unit 5 take place by means of an RFID transponder technology.
  • the sensor unit 4 with the sensor 2 acts as a transponder, which is used by the signal processing unit 5 as a reading device can be read out.
  • the data transmission between the transponder and reading device normally takes place by means of electromagnetic waves. At low frequencies, this is achieved by near-field inductive coupling and at higher frequencies by far-field electromagnetic coupling.
  • a small rechargeable energy storage is usually integrated in active RFID transponders.
  • the synchronization of the timing in the sensor unit 4 and the signal processing unit 5 takes place in this embodiment of the invention in that at the beginning of retrieving the electrical parameter M from the sensor unit 4 by the signal processing unit 5 required energy, eg possibly for charging the energy storage unit, and the clock signal is transmitted to the sensor unit 4.
  • a plurality of sensors 2 can be operated on a signal processing unit 5.
  • an identifier eg in the adjustment parameters X of the sensor unit 4 must be stored for this purpose.
  • the feed of the data D for example the adjustment parameter X into the sensor unit 4 and / or for the adjustment of the conditioning of the uniformly conditioned output signal AS, takes place via a parameterization unit 19 which is assigned to the control / evaluation unit 11, for example.
  • the parameterization unit 19 wants to transmit data D to the sensor unit 4, the parameterization unit 19 signals readiness for transmission to the sensor unit 4 by transmitting a signaling signal to the sensor unit 4 via the wireless connection 15 by means of the transceiver units 17 and the transmission elements 18. After the signaling signal, the sensor unit 4 switches to a reception mode by transmitting the adjustment parameters X from the parameterization unit 19 and the transmission of the electrical quantity M is stopped as a conditioned output signal AS for the time of transmission.
  • Fig. 5 is another, fifth embodiment of the galvanic
  • an optical waveguide 24 is used in this embodiment.
  • the sensor unit 4, if necessary, is supplied with the required energy E via this optical waveguide 24, and at the same time the data D and the conditioned output signal AS are transmitted bidirectionally between the sensor unit 4 and the application-specific evaluation unit 5.
  • optical waveguide 24 the known types, such as multimode or single-mode optical fibers used.
  • a first optical transmitter / receiver unit 25 is provided for coupling and decoupling the optical signals into the optical waveguide 24, and a second optical transmitter / receiver unit 26 is provided in the sensor unit 4.
  • the second optical transmitter / receiver unit 26 consists at least of, for example, a photovoltaic element 28, for converting the optical energy signal E transmitted by the application-specific evaluation unit 5 into an electrical power, and a luminous element 27 for generating the measured variable M as an optically conditioned output signal AS.
  • a photovoltaic element 28 for converting the optical energy signal E transmitted by the application-specific evaluation unit 5 into an electrical power
  • a luminous element 27 for generating the measured variable M as an optically conditioned output signal AS.
  • concentrated solar cells or multilayer solar cells can be used as the photovoltaic element 28.
  • a photosensitive element 29 which receives the data D transmitted by the application-specific evaluation unit 5, can be integrated as a receiver element in the sensor unit 4. This additional photosensitive element 29 is not explicitly shown in the figures and can also be saved if the data signal D is signal-wise from the energy signal E by means of the photovoltaic element 28 distinguish and separate.
  • the photovoltaic element 28 converts the energy signal E into a corresponding electrical energy, at the same time the photovoltaic element 28 receives the optical data signal D and converts it into an electrical data signal D.
  • a first optical transmitter / receiver unit 25 is provided consisting of at least one light-emitting element 27 and a photosensitive element 29.
  • the light-emitting element 27 for example, a light-emitting diode or a laser diode and as a photosensitive element 29, for example, a photodiode or a phototransistor is used.
  • the individual signals are transmitted in different radiation spectra.
  • the corresponding spectral components in the transmitted light signal can be filtered out and thus the individual signals, such as data signal D, energy signal E and conditioned output signal AS, can be separated by signal technology.
  • the signals D, E, AS by modulation types of each other.
  • the energy signal E is generated for example in the first optical transmitter / receiver unit 25 by a laser diode which emits, for example, a continuous light in the infrared range, and in the second optical transmitter / receiver unit 26, the energy signal E from the photovoltaic element 28 in an electrical Energy converted back.
  • This converted electrical energy is used to supply power to the sensor unit 4 and the sensor 2.
  • the sensor unit 4 is not integrated in the transducer circuit 3 and the transmitter 23 in this fifth embodiment. This makes it possible to install the sensor unit 4 with the sensor 2 at a more distant location and separate from the transmitter 23. This separate embodiment of the transducer circuit 3 and the sensor unit 4 can also be applied to the other embodiments in the other figures.
  • the clock synchronization is carried out as in the embodiment in Fig. 3, but by means of an optically transmitted clock signal.
  • FIG. 6 A supplementary embodiment for electrical isolation between the sensor unit 4 and the application-specific signal processing unit 5 is shown in Fig. 6, in which the communication of the electrical parameter M and the data D via a wired connection 14 with separating elements 16 for electrical isolation.
  • Exemplary embodiments of such galvanic separating elements 16 are optocouplers, transformers or coupler structures for the electromagnetic or capacitive coupling of a high-frequency transmission signal.
  • the clock generator 10 is firmly integrated in the structure of the transducer circuit 3 and / or the transmitter 23.
  • Fig. 7 is a seventh embodiment of an inventive
  • a signal processing unit 5 of the first type 5a with a low requirement for the measurement accuracy is permanently integrated in the transducer circuit 3 and / or in the transmitter 23. If, however, a higher requirement for measuring accuracy with the measured value MW of the process variable P is determined, then a signal processing unit 5 with a higher measuring accuracy can be inserted into the slot. If a further signal processing unit 5, for example of the third type 5c with an analog-to-digital converter circuit 8, is inserted into the slot 12, a switching element 20 switches the connecting line 14 to the signal processing unit 5 in the slot 12.
  • the switching element 20 is associated with the slot 12 and is triggered by the insertion of a signal processing unit 5 of the second type 5b or the third type 5c in the slot. In the standard version, therefore, no signal processing unit 5 is integrated in the slot 12. However, if a higher measurement performance is required, the corresponding retrofit kit can be used as signal processing unit 5 of the second type 5b or the third type 5c in the slot 12.
  • Fig. 8 is an eighth embodiment of an inventive
  • Device 1 with a modular transducer circuit 3 and a sensor 2 shown.
  • a further signal processing unit 5 of the first type 5a, the second type 5b or the third type 5c is modularly inserted in the slot 12.
  • the two measured values MW of these two signal processing units 5 are validated and verified in a checking unit 21, which is provided, for example, in the evaluation unit 11.
  • the checking unit 21 carries out a plausibility check or validation of the individual measured values MW relative to one another by the measured values MW ascertained in the slot 12 being inserted into the slot 12 by the measured values in the measuring transducer circuit 3, determined by the first type 5a, second type 5b or third type 5c of the application-specific signal processing unit 5 and / or fixed measured values MW which are permanently determined in the transmitter 23 and integrated with the first type 5a of the application-specific signal processing unit 5.
  • a signal processing unit 5 of the second type 5b or the third type 5c for example in the calibration phase in production and be checked.
  • This functionality of checking the measured value MW of the process variable P of the permanently installed signal processing unit 5 is also useful when a service technician has to check the functionality and measuring accuracy of the field device or the device 1.
  • an embodiment of the second type 5b or the third type 5c can be used as well.
  • FIGS. 9 and 10 show a first and a second application example of the fifth exemplary embodiment from FIG. 5, which applies a device 1 for determining the filling level F of a filling material 32 in a container 31 according to the hydrostatic pressure measuring principle.
  • a second pressure sensor 2 for determining the second measured variable M2 from the top pressure as the second process variable P2 and below the minimum possible fill level F
  • a first pressure sensor 2 for determining the first measured variable M1 as the first Process size P1 installed. If the density of the contents does not fluctuate, a height H of the boundary surface of the contents between the first and second pressure sensor 2 can be determined from this pressure difference taking into account gravity.
  • a level in a container can also be determined with a differential pressure sensor due to a hydrostatic pressure difference.
  • a differential pressure sensor due to a hydrostatic pressure difference.
  • the device 1 for determining the hydrostatic pressure difference designed so that at the position below the lowest level F, a Differenzdruckaufillon is placed on the container 31 and the top pressure is supplied via a capillary to the differential pressure transducer. Owing to Temperature influences on the capillary, the measurement accuracy of the measurement can be adversely affected. Furthermore, it has become known from the publication DE 694 33 185 T2 to determine the differential pressure by means of two individual pressure transmitters which are each connected via an electrical line to a transmitter for determining the pressure difference.
  • the embodiment in Fig. 9 shows a first variant of the device 1 for determining the hydrostatic pressure difference in which below the position of the lowest level F on the container 31 a transmitter according to the invention 23 is mounted with a pressure sensor 2.
  • the transducer circuit 3 in the transmitter 23 additionally contains a first optical transceiver unit 25, via which a further pressure sensor for measuring the head pressure can be connected, supplied and evaluated by means of an optical waveguide 24.
  • At least one light-emitting element 27, for example a light-emitting diode, and a photosensitive element 29 are integrated in the first optical transceiver unit 25.
  • the light-emitting element 27 generates the energy E and the data D as a light signal and couples this light signal into the optical waveguide 24 for transmission to the sensor unit 4.
  • the optical energy E of the light signal is converted back into electrical energy in the second optical transceiver unit 26 of the sensor unit 4, for example by a photovoltaic element 28.
  • the sensor unit 4 is supplied by this converted back energy of the photovoltaic element 28.
  • the second optical transceiver unit 26 contains for transmitting the conditioned output signal AS a luminous element 27 that couples the conditioned output signal AS as a light signal in the optical waveguide.
  • the further pressure sensor 2 for measuring the head pressure via the optical waveguide 24 and by the conversion of the electrical signal into an optical signal is galvanically separated from the remainder of the transmitter 23.
  • the two sensor units 4 send the first measured variable M1 and the second measured variable M2 simultaneously or with a time offset to the Application-specific evaluation unit 5. If the measured quantities M1, M2 are simultaneously sent to the application-specific evaluation unit 5, a difference formation of the two measured variables M1, M2 is provided before the signal evaluation. On the other hand, with a staggered transmission of the measured quantities M1, M2 by the conditioned output signal AS, the difference can be formed after the signal evaluation by the application-specific evaluation unit 5.
  • the embodiment in Fig. 10 shows a second variant of
  • Device 1 for determining the hydrostatic pressure difference at which below the position of the lowest level F on the container 31 a transmitter according to the invention 23 with a pressure sensor 2 is mounted.
  • its modular measuring transducer circuit 3 consists of a sensor unit 4 and an application-specific evaluation unit 5, which communicate electrically isolated via an optical waveguide 24.
  • a further pressure sensor 2 is placed above the maximum filling level F, which communicates with the application-specific evaluation unit 5 by means of the associated sensor unit 4 via a further optical waveguide 24.
  • corresponding second optical transmitter / receiver units 26 are provided in the two sensor units 4, and at least one first optical transmitter / receiver units 25 in the user-specific evaluation unit 5.
  • the optical transmitter / receiver units 26 are designed, for example, such that a separate photosensitive element 28 is provided for each channel or each connected sensor 2.
  • only one laser diode 27 is provided for power supply of the sensor units 4 in the application-specific evaluation unit 5.
  • the signaling separation of the individual channels takes place for example by signal coding, optical multiplexing, separation into different spectral ranges or a spatial or optical Separation.
  • optical pressure sensors as described, for example, in the publications DE 100 556 29 A1, DE 102005016641 A1, EP 1 008 840 A1 and DE 40 18 998 A1.
  • These optical pressure sensors have the advantage that they do not require any additional power supply to the sensor unit 4, but are usually based on measuring the change in an optical property of the optical waveguide 24 or an element, eg a birefringent crystal, at the end of the optical waveguide 24 due to a pressure change.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

L'invention concerne un dispositif (1) comprenant au moins un détecteur (2) destiné à détecter au moins une variable de procédé chimique et/ou physique (P), et au moins un circuit transducteur à structure modulaire (3) présentant au moins une unité détectrice (4) qui détermine une variable mesurée (M) en provenance de la variable de procédé (P) détectée par le détecteur (2), et qui alimente le détecteur (2) en énergie requise, et au moins une unité de traitement de signaux (5), spécifique de l'application, pour la détermination d'une valeur mesurée (MW) provenant de la variable mesurée (M), dispositif caractérisé en ce qu'il est prévu un signal de sortie conditionné (AS) entre l'unité détectrice (4) et ladite unité de traitement de signaux (5), spécifique de l'application, et en ce que cette unité de traitement de signaux (5) est conçue de manière interchangeable, cependant qu'il est prévu plusieurs types différents (5a, 5b, 5c) d'unités de traitement de signaux (5), spécifiques de l'application, en fonction d'une précision de mesure prédéfinie avec laquelle le dispositif (1) détermine les valeurs mesurées (MW).
PCT/EP2007/062395 2006-11-16 2007-11-15 Dispositif présentant un circuit transducteur à structure modulaire WO2008059019A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07822635.4A EP2087319B1 (fr) 2006-11-16 2007-11-15 Dispositif présentant un circuit transducteur à structure modulaire
US12/312,583 US8380463B2 (en) 2006-11-16 2007-11-15 Apparatus having a modularly constructed, measuring transducer circuit
CN2007800426939A CN101583849B (zh) 2006-11-16 2007-11-15 具有模块化构造的测量换能器电路的装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE200610054421 DE102006054421A1 (de) 2006-11-16 2006-11-16 Vorrichtung mit einer modular aufgebauten Messwandlerschaltung
DE102006054421.8 2006-11-16
DE200620018584 DE202006018584U1 (de) 2006-12-06 2006-12-06 Vorrichtung mit einer modular aufgebauten Messwandlerschaltung
DE202006018584.4 2006-12-06

Publications (2)

Publication Number Publication Date
WO2008059019A2 true WO2008059019A2 (fr) 2008-05-22
WO2008059019A3 WO2008059019A3 (fr) 2009-04-23

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PCT/EP2007/062395 WO2008059019A2 (fr) 2006-11-16 2007-11-15 Dispositif présentant un circuit transducteur à structure modulaire

Country Status (3)

Country Link
US (1) US8380463B2 (fr)
EP (1) EP2087319B1 (fr)
WO (1) WO2008059019A2 (fr)

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DE102008029956A1 (de) 2008-06-26 2009-12-31 Endress + Hauser Flowtec Ag Meßsystem mit einem Sensormodul und einem Transmittermodul
DE102008053920A1 (de) 2008-10-30 2010-05-06 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Verteilermodul bzw. damit gebildetes Messsystem

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US8788714B2 (en) * 2010-01-29 2014-07-22 Honeywell International Inc. Method for synchronizing execution of multiple processing devices and related system
DE102012000187B4 (de) * 2012-01-09 2014-02-27 Krohne Messtechnik Gmbh Verfahren zur Überwachung eines Transmitters und entsprechender Transmitter
CH708508A1 (it) * 2013-09-05 2015-03-13 Alessandro Pasquali Interfaccia ottica basata su cella fotovoltaica.
DE102013227174B4 (de) * 2013-12-27 2019-06-19 Fronius International Gmbh Vorrichtung und Verfahren zur Ermittlung eines Isolationswiderstandes einer Photovoltaikanlage
US9322683B2 (en) 2014-05-12 2016-04-26 Invensys Systems, Inc. Multivariable vortex flowmeter
DE102015206873A1 (de) * 2015-04-16 2016-10-20 Siemens Aktiengesellschaft Anordnung, System und Verfahren für eine Überwachung von gasgefüllten Behältern
DE102016101062A1 (de) * 2016-01-21 2017-07-27 Krohne S. A. S. Messgerät zur Messung einer Messgröße
DE102018122014A1 (de) * 2018-09-10 2020-03-12 Endress + Hauser Flowtec Ag Meßgeräte-System sowie damit gebildete Meßanordnung

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DE19755516A1 (de) 1997-12-13 1999-06-17 Conducta Endress & Hauser Messeinrichtung für die Flüssigkeits- und/oder Gasanalyse und/oder für die Messung von Feuchte in Flüssigkeiten und/oder Gasen
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JP2005128002A (ja) * 2003-10-01 2005-05-19 Olympus Corp エンコーダ
DE102004049771A1 (de) 2004-10-12 2006-04-13 Endress + Hauser Flowtec Ag Verfahren zum Betreiben eines modular aufgebauten Feldgerätes der Automatisierungstechnik
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US20060170410A1 (en) * 2004-11-18 2006-08-03 Nesa A/S Compensation of simple fiber optic faraday effect sensors
EP1901145A2 (fr) * 2006-08-23 2008-03-19 MicroNet Sensorik GmbH Dispositif de terrain et son procédé de fonctionnement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008029956A1 (de) 2008-06-26 2009-12-31 Endress + Hauser Flowtec Ag Meßsystem mit einem Sensormodul und einem Transmittermodul
DE102008053920A1 (de) 2008-10-30 2010-05-06 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Verteilermodul bzw. damit gebildetes Messsystem
US10580570B2 (en) 2008-10-30 2020-03-03 Endress+Hauser Conducta Gmbh+Co. Kg Distributor module and measuring system formed therewith

Also Published As

Publication number Publication date
EP2087319A2 (fr) 2009-08-12
US8380463B2 (en) 2013-02-19
EP2087319B1 (fr) 2015-03-11
WO2008059019A3 (fr) 2009-04-23
US20100145481A1 (en) 2010-06-10

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